Accepted:
I - Bloody Host, flexible, adaptable legion with an extremely grim Primarch.
IV - Desert Sons, sneaky sand loving bastards with a sneaky bastard Primarch.
V - Blazing Sisters, Relentless attackers who hit the weak point forever with a loyal Primarch.
IX - Iron Templars, traditional warfare with motorbike cavalry and a chivalrous Primarch.

WIP:
XX - Void Stalkers, space fighters who rip out minds with a psyker Primarch. [@Hank]
X - Lightning war and fast attack [@Savage]
III - Doom Guard. Blitzkrieg legion with a ruthless Primarch. [@Blackbeard]
? - Siege Breakers, resident counter fortification masters. [@Sophrus]
XII - WE NEEDZ MORE DAKKA WARBO-EMPEROR! [@Sarpedon]
? - ? [@JBcool]